Double flap bag and process of making same



May 25, 1937.

G. W.' QPOPPE DOUBLE FLAP BAG AND PROCESS OF MAKING SAME 2 Sheets-Sheet 1 INVENTOR Filed July 20, 1935 GEO/Q65 14 Poppa B Y ATTORNEY May 25, 1937. G. w. POPPE DOUBLE FLAP BAG AND PROCESS OF MAKING SAME Filed July 20, 1935 2 Sheets-Sheet 2 v INVENTQR GEORGE W. POP/0E B Y AT'TORN EIY Patented May 25, 1937 UNITED STATES PATENT OFFICE DOUBLE FLAP BAG AND PROCESS OF,

MAKING SAME Application July 20, 1935, Serial N0. 32,343

particularly to bags having two closing flaps at the mouth thereof.

In my Patent #1,932,749 granted October 31,

1933, I have disclosed a bag having double flaps at the mouth thereof and in said patent the flaps are formed by slitting the edge of the bag tube.

The present invention is an improvement on the type of bag shown in said patent and one of the objects thereof is to provide a bag having two closing flaps so formed that reenforcements are provided at the upper bag corners when the flaps are folded.

The invention is also an improvement on the bag forming the subject matter of my application Serial No. 25,207 filed June 6, 1935 and a further object thereof is the production of a bag having the advantages set forth in my said Patent 1,932,749 and also the advantages of the bag construction disclosed in said application.

A feature of the present invention relates to a paper bag havingtwo closing flaps which flaps are cut directly'froln the bag walls, the base of one flap being shorter than the base of the other flap.

a bag having two flaps at the mouth thereof, which flaps are prolongations of the respective bag walls, the side edges of one of the flaps extending from the upper corners of the bag to the base of the flap and converging towards the center of the bag,

Further features and advantages become apparent from the following descr'i tion and claims when taken in connection with the accompanying drawings in which: f;

, Figure 1 is a' diagrammatic view indicating one method by which my improved bag may be produced on a bag machine of well known construc- 40 tion.

Figure 2 is a view of the completed bag.

Figure 3 is a view ofthe top portion of the bag shown in Figure 2 with one of the flaps folded in side the bag.

Figure 4 is a view similar to Figure 3 but'with the other fiap folded on the outside of the bag.

Figure 5 is a section on the line 5-5 of Figure 4.

Flgure 6 shows a bag section in which one of the flaps is slightly modified over the construc- 50 tion shown in Figure 3.

Figure '7 is a view similar to Figure 6 showing a further modified form of. flap.

Figure 8 is a view showing a still further modification;

Referring to the drawings a tube length tut of A further feature of the invention relates to which a bag is formed, is shown at the lower portion of Figure 1. This tube length comprises a plain wall 2 and a seam wall 4, the center seam 5 being in the wall 4. To complete the bag, the

tube length is folded along the line H onto the seam wall and pasted thereto. The completed bag is shown in Figure 2 with the bottom closed.

The upper or closing flaps are indicated by the reference characters 6 and B. The fiap 8 is cut out of the seam wall of the bag by making cuts which extend from the upper corners of said bag wall towards the center thereof, thereby defining the side edges H) of said flap.

In Figure 2 the side edges 10 of the flap 8 extend in a diagonal direction from the upper corners of the flap to the base or fold line bb thereof.

I Figure 3 the fiap 8 is shown as having been fol ed inside the bag and it will be noted that gussets 52 are formed at the upper bag corners clue to the form of the side edges of the flap 8. When the flap 6 is folded down over the front of the bag as shown in Figures 4 and 5, these gussets form reenforcements for the upper bag corners;

It is not necessary that the edgesof the flap 8 beformed as shown in Figure 2 so long as the flap is so cut that the base of the flapis shorter than the base of the flap 6.

In Figure 6 I have shown a slightly modified form of flap in which the lower portions curve inwardly at l3 and meet the line of fold or base of the flap bb within the bag wall 4.

In the modification shown in Figure '7 the edges of the flap extend parallel to the edges of the bag for a short distance and then slant inwardly along straight lines |4l4, likewise forming a flap having a shorter base than the other flap.

In the Figure 8 construction, the side edges l5 of the flap 8 are parallel with the edges of the bag but are within the bag wall 4. ,Again this construction results in producing a flap having a shorter base line than the other flap.

In the use of the bag it is preferred that the flap 8 be folded inside the bag as shown in Figure 3 and it will be readily understood that by reason of the base of this fiap being shorter than the base of the fiap 6 it is more easily inserted within the bag. Therefore, this construction possesses some advantages over the construction shown in my Patent 1,932,749 hereinabove referred to. This construction also makes it less likely that the bag will tear at the corners when inserting the flap 8 inside the bag and therefore this construction possesses some of the advantages found in the bag disclosed in my application Serial No. 25,207 above referred to.

The bag of the present invention possesses a further advantage due to the gussets l2 which act to reenforce the bag corners when the flap 6 is folded down onto the seam side of the bag.

.It is also tobe noted that the fiap 6 folds on the same side as the bottom closing flap so that the front wall 2 of the bag is entirely plain, giving the appearance of an envelope.

Not only does the bag in its various forms already described possess the several advantages set forth, but such a bag lends itself to a method of manufacture which is both rapid and economical.

A process or method by which this bag may be formed is shown more or less diagrammatically in Figure 1 and in order that the process may be fully understood in its application to a bag machine, reference is made to my prior Patent 1,798,168 granted March 31, 1931. In producing the bag of the present invention, I may use the same type of machine as illustrated in said patent without material changes. I

It is to be understood, of course, that the paper out of which successive bags are to be formed is fed from a roll as shown and described in said patent. For convenience, I shall use as far as possible, reference characters similar to those used in said patent.

The web 20 is fed over a roller indicated by 35 in said patent and either at this time or prior thereto, receives a line of paste indicated at 28 in Figure 1 of the present application. The shaft 52 which may be supported and rotated as described in said patent carries knives 5i! which may be straight or have other shapes depending upon the type of out which it is desired to :make. In Figure l the knives are straight but are set at an angle so that the cuts [0, while running in a general longitudinal direction, make a small angle with the edges of the web. The web passes under a former 32 supported as indicated in said patent, and the web is folded about the former to form a bag tube as, is well known in machines of this type. The forward edge of the former is serrated as indicated at 34. A ,lip knife 90 corresponding to the lip knife shown in said patent, is also pr vided, but this lip knife is formed with a serrate edge which is curved as shown in 36, (Figure 1) so that when the bag tube is severed transversely by the serrated edge of the former and the serrated edge of the lip knife, the top edge of the bag section presents the appearance shown in the lower portion of Figure 1. That is to say the cut produced by the lip knife extends to the bag tube edges and meetsthe cut produced by the edge of the former.

It is also to be noted that the line of severance produced by the lip knife meets the upper ends only of the cuts It). In other words the transverse cuts extend from side to side of both walls of the bag but only the transverse cut in one wall meets the ends of the cuts I0. In this respect the methodof forming the present bag differs from. the method described and shown in said Patent 1,798,168 in that in said patent the tube is severed along lines which connect both ends of the cuts thereby producing a bag having a single flap at its upper or mouth portion.

What I claim is:

l. A bag having a front wall and a rear wall and two flaps at the mouth thereof, one of said flaps being cut from a bag wall so that the base thereof is shorter than the base of the other flap "thereby leaving portions of the other bag wall adjacent the side edges of said flap whereby when said shorter base flap is turned inside the bag and the other flap is folded outside, a reenforcement of the corners of the bag is produced.

2. A bag having a front wall and a rear wall, one of said walls having cuts extending from the upper wall corners towards the center of the bag wall, said cuts being of equal length and defining a flap cup from the bag wall, a portion of the wall from which the flap is cut constituting gussets at the side edges of said flap.

3. A bag having a front wall and a rear wall, cuts extending from the upper corners of one wall towards the center of said wall, said cuts being of equal length and defining two flaps, one of which is-cut out of one wall and the other of which is formed by the otherwall and including the portions of the first said wall between the cuts and the side edges of the 'bag, whereby when said first mentioned flap is folded inside the bag and the other flap is folded outside thereof, a reenforcement of the corners of the bag is produced. GEORGE w. POPPE. 

